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Institutional Holdings of ENZON PHARMACEUTICALS, INC. (ENZN) on 12/31/2011

1. Company Information

Company/StockENZON PHARMACEUTICALS, INC. (stock symbol: ENZN)
Funds Ownership99 out of total 3028 funds (3%) own this stock
Funds own total 47,410,711 shares, 88.50% of all outstanding shares
Funds SOLD -379,888 shares (-0.79%) in the quarter ended on 12/31/2011

2. Top 20 Funds Held ENZN in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)BAUPOST GROUP LLC MA9,000,878Unchanged1.81%16.80%
2.)ICAHN CARL C5,904,863Unchanged0.34%11.02%
3.)IRIDIAN ASSET MANAGEMENT LLC CT4,200,860Cut -5.37%0.55%7.84%
4.)GREAT WEST LIFE ASSURANCE CO CAN 2,259,026Added 12.24%0.11%4.22%
5.)ARTISAN PARTNERS LIMITED PARTNERSHIP2,189,200Cut -5.11%0.05%4.09%
6.)VANGUARD GROUP INC2,065,016Cut -21.38%0.00%3.85%
7.)BRENNER WEST CAPITAL ADVISORS LLC2,041,545Added 7.05%2.94%3.81%
8.)BLACKROCK FUND ADVISORS1,478,490Added 13.18%0.01%2.76%
9.)RENAISSANCE TECHNOLOGIES LLC1,449,062Cut -4.86%0.04%2.70%
10.)NEW MOUNTAIN VANTAGE ADVISERS LLC1,446,015Unchanged0.63%2.70%
11.)NORTH RUN CAPITAL L P1,375,000Unchanged1.24%2.57%
12.)BLACKROCK INSTITUTIONAL TRUST COMPANY NA1,324,685Added 3.86%0.00%2.47%
13.)ARNHOLD & S BLEICHROEDER ADVISERS LLC1,213,387Unchanged0.04%2.27%
14.)UBS AG1,169,780Cut -4.48%0.01%2.18%
15.)DIMENSIONAL FUND ADVISORS INC1,155,957Cut -0.21%0.01%2.16%
16.)STATE STREET CORP1,102,335Cut -13.69%0.00%2.06%
17.)PRICE MICHAEL F755,000Unchanged0.82%1.41%
18.)JET CAPITAL INVESTORS L P642,105Added 53.78%1.01%1.20%
19.)NORTHERN TRUST CORP606,664Cut -1.16%0.00%1.13%
20.)FMR LLC554,788Added 6.53%0.00%1.04%



3. Top 20 Funds Held ENZN in this Quarter (By % of Portfolio) Add to Yahoo Finance Message Board

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)BRENNER WEST CAPITAL ADVISORS LLC2,041,545Added 7.05%2.94%3.81%
2.)BAUPOST GROUP LLC MA9,000,878Unchanged1.81%16.80%
3.)NORTH RUN CAPITAL L P1,375,000Unchanged1.24%2.57%
4.)JET CAPITAL INVESTORS L P642,105Added 53.78%1.01%1.20%
5.)PRICE MICHAEL F755,000Unchanged0.82%1.41%
6.)HARBERT MANAGEMENT CORP264,898Added 0.55%0.63%0.49%
7.)NEW MOUNTAIN VANTAGE ADVISERS LLC1,446,015Unchanged0.63%2.70%
8.)IRIDIAN ASSET MANAGEMENT LLC CT4,200,860Cut -5.37%0.55%7.84%
9.)ICAHN CARL C5,904,863Unchanged0.34%11.02%
10.)FRANKLIN STREET ADVISORS INC NC152,350Cut -0.49%0.34%0.28%
11.)ROUNDVIEW CAPITAL LLC32,800Cut -77.82%0.18%0.06%
12.)ABSOLUTE RETURN CAPITAL LLC141,933New0.15%0.26%
13.)MISSOURI VALLEY PARTNERS INC44,607Cut -23.86%0.14%0.08%
14.)J GOLDMAN & CO LP61,430Added 50.13%0.13%0.11%
15.)GREAT WEST LIFE ASSURANCE CO CAN 2,259,026Added 12.24%0.11%4.22%
16.)SUFFOLK CAPITAL MANAGEMENT LLC131,000Added 16.03%0.10%0.24%
17.)SAN FRANCISCO SENTRY INVESTMENT GROUP (CA)20,000New0.05%0.04%
18.)ARTISAN PARTNERS LIMITED PARTNERSHIP2,189,200Cut -5.11%0.05%4.09%
19.)ZURCHER KANTONALBANK (ZURICH CANTONALBANK)143,132New0.04%0.27%
20.)RENAISSANCE TECHNOLOGIES LLC1,449,062Cut -4.86%0.04%2.70%

4. Top 20 Funds BOUGHT NEW ENZN in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/Call% Port.% Out. Shrs
1.)ZURCHER KANTONALBANK (ZURICH CANTONALBANK)143,1320.04%0.27%
2.)ABSOLUTE RETURN CAPITAL LLC141,9330.15%0.26%
3.)TWO SIGMA INVESTMENTS LLC89,6310.01%0.17%
4.)MILLENNIUM MANAGEMENT LLC32,7040.00%0.06%
5.)UBS OCONNOR LLC21,100PUT0.00%0.04%
6.)SAN FRANCISCO SENTRY INVESTMENT GROUP (CA)20,0000.05%0.04%
7.)SPARK LP DE18,3000.03%0.03%
8.)SUNRISE PARTNERS LLC CT17,4360.01%0.03%
9.)WOLVERINE ASSET MANAGEMENT LLC14,4000.00%0.03%
10.)TWO SIGMA ADVISERS LLC12,5160.01%0.02%
11.)JANE STREET HOLDING LLC11,4680.00%0.02%
12.)WEXFORD CAPITAL LLC10,1000.01%0.02%
13.)NOMURA HOLDINGS INC3,5500.00%0.01%
14.)KISTLER TIFFANY COMPANIES LLC8250.01%0.00%

5. Top 20 Funds SOLD OUT ENZN in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/Call% Port.% Out. Shrs
1.)FRONTPOINT PARTNERS LP150,0000.47%0.28%
2.)LOS ANGELES CAPITAL MANAGEMENT & EQUITY RESEARCH INC71,2460.02%0.13%
3.)GUGGENHEIM CAPITAL LLC32,9270.00%0.06%
4.)SUSQUEHANNA INTERNATIONAL GROUP LLP30,4980.00%0.06%
5.)SPOT TRADING LLC25,900CALL0.00%0.05%
6.)SAN FRANCISCO SENTRY INVESTMENT GROUP20,0000.03%0.04%
7.)AXA FINANCIAL INC18,1330.00%0.03%
8.)TIMBER HILL LLC14,900PUT0.00%0.03%
9.)TIMBER HILL LLC14,200CALL0.00%0.03%
10.)LSV ASSET MANAGEMENT5,1000.00%0.01%
11.)FIL LTD4,2880.00%0.01%
12.)CREDIT AGRICOLE S A4760.00%0.00%
13.)US BANCORP DE 1200.00%0.00%